Can I run a 7GB game on a 4GB RAM iMac?

So im not the expert on macs, and I have GTA san andreas which is about like 5gb and I have a 4gb memory iMac, and that works fine. I'm now downloading borderlands and thats 7gb, would I be able to run that on my mac? Considering its an extra 2gb worth, I thought I had better ask, in case there was a biiggg difference.

NOTE: When I say RAM, I mean memory, I'm not sure if they're the same thing.. but I can't seem to change my title :/

Like someone stated, you can install something that is 100gb with even 1gb ram. Ram is basically how much your computer can handle at once. The 7gb in your game basically means how much space it will take up on your HARD DRIVE , not ram.

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